I always telling friends of mine to have bigger aperture to get clearer Milky way shot … and it really give impact with more light fall onto the sensor … but what if we do not have big aperture len .. e.g. we own F4 or F3.5 lenses ?

and I share this before .. How I shoot Milky Way/Star

theoritical , if we can increase the shutter time which allow more light abosrb on the sensor.. we should able to capture beautiful stars sky … but according to the rule 600

…

I had aiming a polarie star tracker but too bad, i had been turn down by the cost and size …

recently, I managed to test the

Vixen Polarie… a square box size small and weight <1kg … and not really difficult to operate …

i may not able to share how do use this .. but it is really simple and let me share the simple test result

both shoot at F4 , exp 151s +- , ISO 400

1. without start tracker – Vixen Polarie

2. witho start tracker – Vixen Polarie

with minimu setup time and minimu knowledge of Astronomy , I am able to create a image without “start trail” effect

**** rule 600 simply basic rule to avoid “star trail” effect while we have too long exposure on our effective focal length.. e.g.

16mm on FULL frame, we should have max exposure of 600/16=37.5s

16mm on canon APS-c , we should have max exposure of 600/16*1.6=23.4

so if we have anything more than the exposure time the the rotation of earth will create “star trai;” effect create blur effect on to our frame.